Emerson 350, 250 operation manual LTM Troubleshooting, Transmitter Calibration

8.0 Calibration

There really is no need to re-calibrate this instrument. The LTM-Series arrive calibrated to specified measuring ranges at order placement.

If the need arises and a recalibration is deemed necessary please follow these instructions carefully.

Level simulation will be required at 0% and 100% positions.

1.Verify the “probe length” is not the same as the” measuring range” desired. If so please change accordingly.

See Sections 2.1 and 7.1.

2.Go to the “Change Range” menu and set the desired URV (measuring range).

3.Go to the “Trim Sensor” menu and enter.

4.At the “Trim Zero” screen place the level (or magnet/float) at 0% (4mA point) and then press enter.

5.At the “Trim Span” screen place the level (or magnet/float) at 100% (20mA point) and then press enter.

6.“Exit” the configuration menus and the instrument should be calibrated. If not begin to troubleshoot or consult factory for assistance.

Error Preventative Calibration: The LTM-250/350 transmitters are protected from incorrect calibration so if something is done incorrectly it will display “Span Error” on the LCD for 5 seconds and then return to the beginning of the “Trim Sensor” menu.

Recommendation: Again there is no need to recalibrate the instrument simply go to the “Change Range” menu and adjust the LRV or URV as desired.

8.1 Troubleshooting

Magtech manufactures custom built products so each transmitter has been specifically designed to fit on a magnetic level gage or be inserted into a tank/vessel and has been approved by the end user at some point during the ordering/purchasing process. Each transmitter has been factory calibrated to meet end user requirements so there is no need to recalibrate these transmitters unless the requirements have changed from the time of purchase/delivery to installation. If the need arises to calibrate these units to a new range please carefully read and follow the calibration procedure in the instruction and operation (I/O manual) or consult the factory. Always feel free to contact the factory if any questions or uncertainties arise. The following guide has been established to guide the end user through some troubleshooting procedures if the need arises.

There are 3 basic scenarios that can potentially cause issues. They are:

1.Physical damage to the sensor probe. Accidents can happen during the installation process and if the sensor is permanently bent, bowed, or kinked it will no longer work properly. Some symptoms of damage to the sensor probe are:

a.Erratic output, unit jumping to full scale (alarm mode) randomly, usually around the damage point.

b.Unit in constant alarm condition

c.Unit going into alarm condition after a certain point.

If the unit arrives damaged please contact factory immediately.

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